<!--SIF Implementation Specification 2.2-6 (March 17, 2008)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:complexType name="CurriculumStructureType">
    <xs:sequence>
      <xs:element name="Titles">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Title" maxOccurs="unbounded" type="xs:normalizedString" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="Description" minOccurs="0" nillable="true" type="xs:string" />
      <xs:element name="SubjectArea" minOccurs="0" nillable="true" type="sif:SubjectAreaType" />
      <xs:element name="CurriculumHierarchyLevel">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Number" type="xs:unsignedInt" />
            <xs:element name="Name" type="xs:normalizedString" />
            <xs:element name="Description" type="xs:string" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="PredecessorObjects" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="CurriculumStructureRefId" minOccurs="0" maxOccurs="unbounded" type="sif:IdRefType" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="LearningObjectives" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="LearningObjective" minOccurs="0" maxOccurs="unbounded" type="xs:string" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="ComponentObjects" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="ComponentObject" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:simpleContent>
                  <xs:extension base="sif:IdRefType">
                    <xs:attribute name="SIF_RefObject" use="required">
                      <xs:simpleType>
                        <xs:restriction base="xs:token">
                          <xs:enumeration value="CurriculumStructure" />
                          <xs:enumeration value="Lesson" />
                          <xs:enumeration value="Activity" />
                          <xs:enumeration value="Assessment" />
                          <xs:enumeration value="LearningResource" />
                        </xs:restriction>
                      </xs:simpleType>
                    </xs:attribute>
                  </xs:extension>
                </xs:simpleContent>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="LearningStandards" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="LearningStandardItemRefId" minOccurs="0" maxOccurs="unbounded" type="sif:IdRefType" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Metadata" minOccurs="0" nillable="true" type="sif:SIF_MetadataType" />
      <xs:element name="SIF_ExtendedElements" minOccurs="0" nillable="true" type="sif:SIF_ExtendedElementsType" />
    </xs:sequence>
    <xs:attribute name="RefId" use="required" type="sif:RefIdType" />
    <xs:attribute ref="xml:lang" use="required" />
  </xs:complexType>

  <xs:element name="CurriculumStructure" type="sif:CurriculumStructureType" />

</xs:schema>